1.去除开头的一个或多个空格
#echo " forand 123 00 a " | sed 's/^[ ]*//g' #echo " forand 123 00 a " | sed 's/^[[:space:]]*//g' #var=" forane 123 00 a ";echo $var
2.去除所有空格
echo " forand 123 00 a " |tr -d " "`
var=" forand 123 00 a ";echo ${var// /}
echo " forand 123 00 a " | sed 's/^[[:space:]]*//g'
echo " forand 123 00 a " | awk '{gsub(/ /,"")}1'